<template>
  <div class="Roles-container">
    <!-- 面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex -0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane
            label="基本信息"
            name="0"
          >
            <el-form-item
              label="商品名称"
              prop="goods_name"
            >
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item
              label="商品数量"
              prop="goods_number"
            >
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item
              label="商品价格"
              prop="goods_price"
            >
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item
              label="商品重量"
              prop="goods_weight"
            >
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item
              label="商品分类"
              prop="'goods_cat'"
            >
              <!-- 级联选择器区域 -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateGorieslist"
                :props="catePrpos"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>

          </el-tab-pane>
          <el-tab-pane
            label="商品参数"
            name="1"
          >
            <!-- 渲染表单的item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyData"
              :key="item.attr_id"
            >
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  border
                  :label="cb"
                  v-for="(cb,i) in item.attr_vals"
                  :key="i"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品属性"
            name="2"
          >
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品图片"
            name="3"
          >
            <!-- 图片上传区域 -->
            <!-- action表示图片要上次到的后台地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :headers="headerObj"
              list-type="picture"
              :on-success="handleSuccess"
            >
              <el-button
                size="small"
                type="primary"
              >点击上传</el-button>

            </el-upload>
          </el-tab-pane>
          <el-tab-pane
            label="商品内容"
            name="4"
          >
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button
              type="primary"
              class="btnAdd"
              @click="add"
            >添加商品</el-button>
          </el-tab-pane>

        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%"
    >
      <img
        :src="previewPath"
        alt=""
        class="previewImg"
      >
    </el-dialog>

  </div>
</template>

<script>
import _ from "lodash"
export default {
  data() {
    return {
      activeIndex: "0",
      // 商品信息表单对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品分类所属的数组
        goods_cat: [],
        // 图片数组
        pics: [],
        // 商品的详情描述
        goods_introduce: "",

        attrs: []
      },
      // 表单对象规则
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", tirgger: "blur" }
        ],
        goods_cat: [
          { required: true, message: "请选择商品分类", tirgger: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入价格", tirgger: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入数量", tirgger: "blur" }
        ],
        goods_weight: [
          { required: true, message: "请输入重量", tirgger: "blur" }
        ]
      },
      // 商品分类列表
      cateGorieslist: [],
      // 级联选择器配置对象
      catePrpos: {
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      // 动态参数
      manyData: [],
      // 静态属性
      onlyData: [],
      // 上传图片的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",

      // 图片上传的headers
      headerObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      // 预览图片的路径
      previewPath: "",
      // 控制图片预览对话框的显示与隐藏
      previewVisible: false
    }
  },
  created() {
    this.cateGories()
  },
  methods: {
    async cateGories() {
      const { data: res } = await this.$http.get("categories")
      if (res.meta.status !== 200) {
        return this.$Message.error("获取商品分类失败")
      }
      this.cateGorieslist = res.data
      console.log(this.cateGorieslist)
    },

    // 级联选择器选中项变化会触发这个函数
    handleChange() {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      // console.log("即将离开的标签页名字是" + oldActiveName)
      // console.log("即将进入的标签页名字是" + activeName)
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$Message.error("请先选择商品分类")
        return false
      }
    },
    async tabClicked() {
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "many" } }
        )
        console.log(this.cateId)
        if (res.meta.status !== 200) {
          return this.$Message.error("获取动态动态参数失败")
        }
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ")
          console.log(item.attr_vals)
        })
        this.manyData = res.data
        console.log(this.manyData)
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "only" } }
        )
        if (res.meta.status !== 200) {
          return this.$Message.error("获取静态属性失败")
        }
        this.onlyData = res.data
        console.log(this.onlyData)
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file)

      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      console.log(file)
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 在数组中要查找对应项的索引值findIndex()里面接收一个箭头函数 x 代表数组的每一项
      // 3.调用数组的 splice 方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response)
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)

      console.log(this.addForm)
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$Message.error("请填写必要的表单项")
        }
        // 执行添加的业务逻辑
        // lodash  cloneDeep(obj) obj拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(",")
        // 处理动态参数
        this.manyData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" ")
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        // 把处理的动态参数和静态属性赋值给form.attrs
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起添加商品
        // 商品的每次，必须是唯一的
        const { data: res } = await this.$http.post("goods", form)
        if (res.meta.status !== 201) {
          return this.$Message.error("添加商品失败")
        }
        this.$Message.success("添加商品成功")
        this.$router.push("/goods")
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
